Calculating machine



J. A. V. TURCK CALCULATING MACHINE Oct. 24, 1950 Filed July' 16. 1943 12 Sheets-Sheet 1 OC- 24, '1950 J. A. v. TuRcK 2,527,467

CALCULATING MACHINE Filed July 16, 1945 12 sheets-Sheet 2 0ct. 24, 1950 J. A. v. TURCK CALCULATING MACHINE 12 Sheets-Sheet 5 Filed July 16, 1943 l" uw mm Oct. 24, 1950 J. Afv. TuRcK CALCULATING MACHINE 12Sheets-Sheet 4 Filed July 16, 1943 Oct. 24, 1950 Filed July 16, 1945 J. A. V. TURCK CALCULATING MACHINE 12 Sheets-sheet 5 Oct. 24, 1950 .1. A. v. TuRcK CALCULATING MACHINE 12 sheds-sheet e Filed July 16, 1943 Oct. 24, 1950 J. A. v. TURCK CALCULATING MACHINE 12 Sheets-Sheet 7 Filed July 16, 1943 Oct. 24, 1950 J. A. v. TURcK CALCULATING MACHINE Filed July 16, 1943 12 Sheets-Sheet 8 fade/dw Oct. 24, 1950 1 A v TURCK 2,527,467

CALCULATING MACHINE Filed July 161945 12 Sheets-Sheet 9 J. A. V. TURCK CALCULATING MACHINE Oct. 24, 1950 Filed July 16, 1943 y l2 Sheets-Sheet l0 jpg/7 l nnnnnll "Inu" Oct. 24, 1950 1, A, v, TURK 2,527,467

CLCULATING MACHINF Filed July 16, 1943 l2 Sheets-Sheet 11 Oct. 24, 1950 .1. A. v. ruRcK CALCULATING MACHINE 12 Sheets-Sheet l2 Filed July 16, 1943 Patented Oct. 24, 1950 CALCULATING MACHINE Joseph A. V. Turck. Wilxnette, Ill., mig-nor to Felt & Tarrant Manufacturing Company, Chicago, Ill., a corporation of Illinois Application July 16, 1943, Serial No. 494,907

(Cl. 23S-82) 12 claims. l

This invention relates in general to calculating machines and has more particular reference to key-responsive, multi-order machines capable of positive and negative forms of calculation. The term positive calculation as used herein is intended to include both addition and multiplication and the term negative calculation as used herein is intended to include both subtraction and division.

A primary object of the invention is to facilitate and to simplify the use of such a machine for positive and negative forms of calculation.

An important object of the invention is to permit the pre-setting of such a machine for the desired form of negative calculation whereupon the machine responsive to key operation will automatically perform the preset form of negative calculation.

Another important object of the invention is the provision in such a machine of automatic means for automatically reconditioning the machine for` positive calculation upon the completion of each subtractive calculation.

A further important object of the invention is to provide manual means for reconditioning the machine for positive calculation after the completion of each negative calculation.

Another important object of the invention is the provision in such calculating machines of improved negative and positive calculating means which is responsive to uni-marked keys to perform the various forms of positive and negative calculation.

The invention has as another important object the provision of improved negative and positive calculating means capable of embodiment not only in a single register type of machine for accumulating and registering answers of individual calculating operations, but also in a supertotalizer type of machine for transferring answers or numbers registered in a primary register to a secondary register at the will of an operator and therein when desired to accumulate and register answers resulting from several calculating operations, including either positive or negative calculation or Iboth positive and negative calculation.

Another object of the invention is the provision of means for visually notifying lthe operator that the machine, including the secondary register has been conditioned for subtraction.

Numerous other objects and advantages of the invention will be apparent as it is better understood from the following description which considered with the accompanying drawings discloses a preferred embodiment of the invention.

In the drawings:

Fig. 1 is a top plan view of a super-totalizer type of calculating machine embodying the invention and shows a suitable arrangement of several denominational orders of digital keys and the control keys for presetting the machine for the various forms of calculation; 1iiFig1. 2 is a side view of the machine shown in Fig. 3 is a fragmentary longitudinal section of a calculating machine embodying the invention Laken along a plane adjacent a column of digital SYS;

Fig. 4 is a fragmentary longitudinal section of the calculating machine shown in Fig. 1 taken on a plane adjacent a column of digital keys;

Fig. 5 is a side view of the trains of gears included in the primary and secondary registering mechanism;

Fig. 6 is a perspective view of the mechanism controlling the transfer of numbers from the primary to the secondary registering mechanism;

Fig. 7 is a plan view of the shifting bar ernployed in the transferring mechanism illustrated in Fig. 6;

Fig. 8 is a transverse sectional detail showing a portion of the supplemental or secondary register;

Fig. 9 is a fragmentary detail view of the driving means for the actuating sectors of the secondary register;

Fig. 10 is a longitudinal section showing a portion of the novel calculating machine and taken at the right side thereof to bring out certain details of the transfer and subtraction control means;

Figs. 11 and 12 are fragmentary elevational views of a portion of the machine taken from opposite sides to bring out certain construction and assembly details of the subtraction contro mechanism;

Fig. 13 'is a fragmentary detail view of the digital control mechanism and its shifting means;

Figs. 14, 15 and 16 are enlarged detail views of a portion of the machine and show the automatic actuation control mechanism in various stages of operation;

Figs. 17 and 18 are enlarged transverse sectional views taken at the rear of the machine to show certain details of the automatic actuation control mechanism, parts being omitted for the sake of clarity:

Figs. 19, 20v and 21 are detail views of the mechanism connecting the digital stop bars and the respective actuating sectors;

Fig. 22 is a detail view of the means for maintaining the digital control shaft in any of its preset positions respectively predetermining the various forms of calculation;

Fig. 23 is a fragmentary detail view taken at the rear of the machine and shows, with certain parts omitted for the sake of clarity, in elevation the actuation control means for the #9 keys;

Figs. 24, 25 and 26 are cross-sectional views taken at the rear of the machine and shows in side elevation the actuation control means for the #9 keys in various stages of operation;

Fig. 27 is a fragmentary detail view showing the lock for the digital control bar shifting link and the means for clearing it upon zeroizing;

Fig. 28 is a top plan view of a portion of the calculating machine, with the keyboard and other parts omitted for clarity, to show the .arrangement of the digital control stop bars;

Fig. 29 is a cross-sectional detail view of a portion of the machine and shows a means for reconditioning the machine for additive actuation;

Fig. 30 is a fragmentary longitudinal section taken through the calculating machine of Fig. 1 on a plane adjacent the overflow column and shows certain details of the division and supertotalizer control means;

Fig. 31 is a detail view of the super-totalizer control key and associated mechanism;

Fig. 32 is a fragmentary detail view showing means for locking the add key when the subtraction control key has been depressed and machine is conditioned for subtraction.

For the purpose of illustrating the invention the drawings show a key-responsive, multi-order, power driven calculating machine like those disclosed in United States Letters Patent No. 1,391,220, issued September 20, 1921, and No. 2,063,962, issued December 15, 1936. It is not, therefore, deemed necessary to repeat herein the detailed disclosure of those patents. It may be well, however, by way of rexplanation to point out parts and operation of such machines which will assist in an understanding of the instant invention.

The various instrumentalities of such a machine are provided with a suitable outer casing 33 wherein they are mounted on skeleton frame members or partition plates 34 disposed between the actuating mechanisms of the several denominational orders and secured together in spaced relationship by suitable tie rods 35. As shown in Figs. 1 to 4 a plurality of rows or columns of digital keys 36 are provided with depending stems which are slidably arranged through a keyboard 31. The keyboard 31 as illustrated includes an upper plate 38, a lower plate 39 spaced therefrom, and an intermediate plate 4I disposed between and in spaced relationship to the upper and lower plates, and the keyboard is positioned to serve as a part of the upper wall of the casing 33. The digital keys 36 are normally individually held in their upper position by springs 40, which, as shown in Figs. 3, 4 and 10 are arranged between the upper and intermediate key plates 38 and 4I.

It will be understood that the keys 3B serve to initiate the operation of multi-order actuating mechanism for a multi-order accumulator mechanism or register. One order of actuating mechanism is associated with each of the columns of keys and with each order of accumulator mechanism, whereby, responsive to key operation, the

accumulator mechanism is actuated by the actuating mechanism. While no two keys 36 of the same column or denominational order may be operated simultaneously, any key of one order may be operated at the same time as any key of each of one or more other denominational orders.

In such a machine upon depression of a digital key 36 in any column oi' keys, its stem 42 engages and depresses a parallel motion bar 43 associated with that column of keys and pivoted at its forward and rear ends to levers 44 and 45, respectively. Those levers 44 and 45 are in turn pivotally carried on front and rear shafts 4B and 41 which extend through and are supported by the partition plates 34. The depression of the parallel motion bar in any denominational order of the machine operates a power trip mechanism in the same order, which includes a spring held dog 48 and a spring biased latch 43. Each dog 43 and its associated latch 49 are pivotally mounted in cooperative relationship on the parallel motion bar 43 and a power trip bar or link 5|, respectively, in the same denominational order. The power trip bars or links 5I extend between and are pivoted at their opposite ends to the levers 44 and 45.

When any power trip mechanism is so operated by depression of one of the keys 33 in the associated column of keys, the power trip mechanism operates an associated power clutch in the same order, including a clutch hook 52 pivoted at one end to a pivoted upstanding guide arm or member 53 and a clutch or toothed wheel 54. All of the clutch wheels 54 are fixed on a transordinal power shaft 55 which is suitably connected to an electric motor 55 for rotating the shaft 55 to rotate the clutch wheels 54 in a counterclockwise direction as viewed in Fig. 3. 'I'he operation of the power clutches by the power trip mechanisms causes each clutch hook 52 to engage a tooth of the associated rotating clutch wheel 54. When so engaged the clutch hook swings the associated guide arm 53 in a counterclockwise direction (Fig. 3) until a tooth following that engaged by the clutch hook 52 engages the shank thereof and cams the hook upward out of engagement with the clutch wheel 54, thus ending a power stroke or action in the machine.

In so swinging any pivoted guide arm 53 rearwardly or counter-clockwise in any denominational order of the machine, the motor 53 through the power clutch and the guide arm tensions or energizes a calculating spring 51 anchored at its forward end to the partition plate 34 and secured at its rear end to the guide arm 53. As a result of the energization of the spring 51 as just described, the spring will swing the pivoted guide arm 53 forwardly in a clockwise direction when the clutch hook 52 is disengaged from the clutch wheel 54 at the end of the power stroke.

Thus the pivoted guide arm 53 in the order associated with the depressed key is oscillated or rocked by the motor 5B and the spring 51 when the key is depressed, moving in one direction under the driving power of the motor to energize the spring, and being moved in the opposite direction by the spring to provide the driving force for that order of actuating and accumulating mechanisms to eect calculation. The oscillatory or rocking movement of each pivoted guide arm is transmitted through an actuating link 53, pivotally connected at its rear end to the guide arm and at its forward end, by a, yielding clutch or compensating device 53, to a rack or gear sector 6| mounted on a transordinal shaft 62 extending through the partition plates 34. as described in United States Letters Patent No. 2,287,151, issued June 23, 1942.

The gear sector or gear sectors 6| are swung downwardly in a clockwise direction (Fig. 3) during the power stroke and the extent of such downward movement is limited responsive to key operation enabling the gear sector or sectors 6| upon return to impart the degree of digital advancement to the accumulator mechanism, which corresponds in each operated order to the particular key 36 depressed in that order. The compensating device 59 permits the continuation of the rearward movement of the link 58 after downward movement of the sector 6| has beenstopped and until the end of the power stroke when the clutch hook 52 in each effective order is automatically disengaged from its associated clutch wheel 54. When so disengaged the calculating spring moves the link or links 58 forwardly (Fig. 3), and the compensating device 59 in each effective order permits movement of the parts in reverse direction after the gear sector or sectors 6| have been returned to their normal positions and until the link or links 58 have been moved forwardly to their initial positions.

Each gear sector 6| responsive to the keys 36 in the associated column of keys is thus operable to rotate an accumulator actuating pinion 63, one such pinion being provided in each order of the machine on a transverse shaft 64 common to all of the pinions 63 and supported by the partition plates 34. Rotation of each pinion 63 is transmitted through an internal rachet mechanism (not shown) to a combined lantern wheel and accumulator gear 65 also on'the shaft 64. The gear of'each combined lantern wheel and accumulator gear meshes with a carrying gear 66 (Fig. 5) journaled on a transverse shaft 61 which is parallel to the shaft 64. Besides meshing with the lantern wheel and accumulator gear 65, each carrying gear 66 meshes with an intermediate gear 68 journaled in the same order on a transverse shaft 69, and that intermediate gear in turn meshes with a numeral wheel pinion 1| journaled in the same order on a transverse shaft 12 and fixed to a numeral wheel 13.

For imparting a digital unit of actuation in each order of accumulator mechanism above the units order, whenever a tens transfer is to take place from the next lower denominational order of the accumulator, carrying mechanism is provided in the machine. Such mechanism is fully disclosed in United States Letters Patent No. 1,357,747 and 1,357,748, both issued November 2, 1920, and therefore will be only briefly described herein. The carrying mechanism includes a carrying cam member 14 which is rotated 180 degrees by a spring for each tens transfer that is to be effected. Each carrying cam member 14 is adapted to swing a bell crank carrying lever 15 in a counter-clockwise direction as viewed in Fig. 4. Such swinging of the carrying lever 15 causes a carrying pawl 16 pivotally mounted thereon and having an actuating or engaging end 11 (Fig. 30) to rotate the combined lantern wheel and accumulator gear 65 a sufficient distance to impart through the above described train of gears 66, 68 and 1| a digital unit of actuation to the numeral wheel 13.

The carrying mechanism just referred to, the gears 66, 68 and 1|, the numeral wheels 13, and the shafting for such gears and numeral wheels are included in the registering mechanism which shall hereinafter sometimes be called for convenience the primary register. That primary register includes a rock frame having a plurality of spaced frame plates 18 pivoted to swing or rock about the transverse shaft 69 in a clearing or zeroizing action and supporting the transverse shaft 61 on which is mounted the carrying gears 66.

Thus far the description applies alike to the single register type as well as to the supertotalizer type of calculating machine. By referring to Figs. l, 4 and 5, however, it will be noted that the super-totalizer type of machine includes, in addition to the instrumentalities already referred to, another or secondary register. Like the above described primary register. the secondary register includes in each denominational order a combined lantern wheel and accumulator gear 65' on a shaft 64 common to all of those combined lantern wheels and accumulator gears, a carrying gear 66' meshing with the gear 65 and on a shaft 61 common to all of those carrying gears, an intermediate gear 68' meshing with the carrying gear 66 and on a shaft 69 common to all of those intermediate gears, a numeral wheel pinion 1| meshing with the intermediate gear 68 and on a shaft 12 common to all such pinions, a numeral wheel 13 fixed to each numeral wheel pinion 1|', and carrying mechanism with a carrying cam 14', a bell crank carrying lever 15 and a carrying pawl 16 (Fig. 30) having an actuating or engaging end 11 functioning respectively like the similarly designated parts of the primary register as just described.

Also like the primary register, the secondary register includes a rock frame having a plurality of spaced frame plates 18 pivoted to swing or rock about the transverse shaft 69' during a clearing or zeroizing operation of the secondary register and supporting the transverse shaft 61' on which is supported the carrying gears 66. The primary and secondary registers are arranged in tandem relationship somewhat as in the aforesaid United States Letters Patent No. 1,391,220. As so arranged, a sliding or shifting gear 19 mounted in each rock frame section of the primary register on a lower detent shaft 8| is at all times engaged with one of the carrying gears 66 of each order. The gears 19 are shiftable or slidable axially of the shaft 8| sufficiently to engage the gears 65 of the combined lantern wheels and accumulator gears in the secondary register, when the primary rock frame is swung forward about its pivot shaft.

Those shifting gears 19 (Figs. 4, 5 and 6), sometimes called the transfer gears, are so mounted on the lower detent shaft 8| of the primary rock frame that they turn with the carrying gear 66 of the same orders whenever a zeroizing action occurs in the primary register. The transfer gears 19 during a zeroizing action of the primary rock frame are normally too far to the left to engage the gears 65 of the secondary accumulator wheels and therefore no transfer from the primary to the secondary register occurs when the primary rock frame is swung forward in its zeroizing action.

In the illustrated machine the transfer gears 19 serve to connect the two registers together and to transfer the total of the primary wheels to the total of the secondary wheels when de- To that end means is employed to shift the esame? gears 18 to a position for such a transfer. As shown in Figs. 5, 6 and '1, they are shiftable to 'the right suillciently to mesh with the wheel gears 88 when the primary rock frame is swung forwardly on its pivot shaft 88. To accomplish this the hub of each gear 19 is so formed as to provide a groove 82 in which a shifting fork 88 engages to move the gears axially to and from alignment with the respective gears 8l' without disengaging the gears 19 from the carrying gears 88. Each shifting fork 83 is provided with a lug 84 curved on a radius with the pivot shaft 88 of the primary rock frame and is slidably mounted on an upper detent shaft 85.

As means for shifting all of the gears 19 as a unit, a notched flat rod 88 having spaced notches or slots 81 therein is slidably arranged in and supported by openings in the framework provided for supporting the secondary register so that the curved lugs 84 of the shifting forks 88 pass through the notches 81 of the flat rod 88. That flat rod 86 extends across the machine transordinally and is operable by a lever 88. The lever 88 is connected to another lever 89 by a link 9|, and a transfer key 92 with a stem passing through the keyboard 81 is arranged to operate the described train of levers and links to shift the flat rod 86 to the right (Fig. 6).

Thus the transfer key 92 during downward movement shifts all the transfer gears 19 from left to right where they will still be in engagement with the respective carrying gears 88 of the primary register and in such a position laterally in their orders that when a zeroizing action of the primary register is produced the forward rocking of the primary rock frame will move the transfer gears 19 into engagement with the respective gears 85 of the secondary register. The carrying spring action utilized in the primary register to return the carrying gears 88 and their numeral wheels 13 to zero as described in the aforesaid Patent No. 2,063,962 transmits a torque to the combined lantern wheels and accumulator gears 65' through their geared connection with the transfer gears 19, tending to turn the wheels and gears 65'. Since a like carrying spring in the secondary register produces a like torque in the opposite direction, the one spring action resists the other and no action under such conditions will take place.

In the operation of the primary register as in the machine described in the patent just mentioned above, accumulation is produced through a gear pinion and rachet movement by action received from one or more actuating gear sectors 8|. Similar means are provided herein for actuation of the secondary register. Such means is in the form of spring actuated gear sectors 88 (Figs. 4 and 8) with coil springs 94 on a threegrooved transordinal shaft 95 to actuate the denominational orders of the secondary register through the combined lantern wheels and accumulator gear 85'. The springs 94 provide power to overcome the resistance of the secondary register to the above described torque from the primary register carrying spring action.

Novel means is employed to prevent the gear sectors 98 from normally operating the secondary register and turning its numeral wheels. Such means comprises a plurality of toothed detent wheels 98, one for each denominational order of the machine, and associated pivoted detents 91 (Figs. 4 and 8) operable by lifting levers 98, each lever 98 being provided with a jaw' 98 operating on a pin l0| in an arm |82 of the associated detent 81. That detent or locking arrangement serves to prevent any of the stored auxiliary power in the springs 94 from being expended until such time as the secondary register detent wheels 88 are unlocked which occurs contemporaneously with the forward swing of the primary rock frame in a zeroiz- 1118 actuation. At that time the curved arms 84 of the shifting forks 88 swing about the pivot 89 of the primaryrock frame and in shifted position engage with downwardly projecting arms |88 of the levers 98, throwing the detents 81 out of their detent wheels 88. When that occurs the super-totalizer or secondary register is free for operation by the auxiliary gear sectors 88, the degree of action being controlled by the distances rotated during the return of the primary numeral wheels to zero.

From the foregoing description it will be understood that the zeroizing of the primary register by a zeroizing lever |04 is effected at the same time that the total transfer key 82 is pressed. The transfer key 92 and the zeroizing lever |04 are so arranged that the former may be depressed with the thumb. and the forefinger may be utilized to operate the latter. Such coordination of those two manipulative devices brings about a transfer. Without such coordinationthe transfer gears 18 will not engage the gears 85' of the secondary register at the proper moment.

To assure such coordination a locking lever |05 is provided with a bent lip |08 at its upper end (Fig. 10) and is pivoted at its lower end so that the bent lip |06 will cooperate with an upper notch |01 and a lower notch |08 in the stem of the transfer key 82. When the zeroizing handle |04 is pulled forward without depressing the transfer key 92, the lip |08 will pass through the lower notch |08 of the transfer key. The transfer key 82 will thus be locked against depression while the zeroizing handle is pulled forward and remains locked against depression until the zeroizing handle returns to its normal position. When the transfer key 92 is depressed before the zeroizing handle is pulled forward, the bent lip |08 will pass `through the upper notch |01 of the transfer key stem during the forward movement of the zeroizing handle. The transfer key 92 will thus be held down until the zero action is completed.

Thus the transfer gears 19 are shifted to the right (Fig. 6) where they will engage the gears 85 of the secondary register when the transfer key 92 is depressed and zeroizing lever |04 is moved forward. During the resulting forward swing of the primary rock frame the curved arms 84 moving therewith release the locking de- .tents 91 so that the auxiliary gear sectors 98,

through the tension of their springs 94, may operate the secondary register accumulator wheels, whereby to accelerate the normal return of the primary numeral wheels to zero. To overcome the resistance of the secondary register to the torque of the carrying spring action of the primary register, means is provided for automatically storing power in the gear sector springs 84 after thetransfer has been accomplished and for resetting the gear sectors 98 to their normal position. To that end the power drive shaft 55 is provided with a gear pinion |88 (Figs. 9 and 10) beneath which a larger spur gear is rotatably mounted on a swinging arm ||2 pivoted at ||8 to the frame of the machine. The arm ||2 has an extension beyond the pivotal mounting of the arm |I2 and a stud xed in the frame and the,

toggle is operated by a spring ||1. When the toggle is made up the gear I|| will be lifted into engagement with the pinion gear |09 which normally by its motion immediately starts counterclockwise movement of the gear I (Figs. 9 and 10).

That toggle action I4 and I I5 is normally held against making (through the action of its spring ||1) by the action of a latch arm ||9 pivotally mounted on the frame of the machine. The latch arm I I9 is provided with a latch lug I9 for co-acting with the trigger arm I6 of the toggle lever I I5 to latch the toggle against operation by its spring ||1. The latch arm I I9 is provided with a pickup link |2| extending forwardly toward the front of the machine and provided at its forward end with a hook |22. The link |2| is normally supported by an upwardly extending link |20 attached at its upper end to the lever 89 of the transfer gear shifting mechanism by a pivot stud as shown in Fig. 6 and is attached to the pickup link |2| by a stud at its lower end operating in a slot arranged to receive the stud.

The transfer key 92 when depressed lowers the link |20 and allows the pickup link I2 to drop at its front end so that a pin |23 in the lower end of a zero lever |24 of the zeroizing mechanism may pick up the hook |22 of the pickup link |2|. As the pin |23 moves forwardly in a clearing or zeroizing operation it causes the pickup link |2| to be drawn forwardly and the latch lug ||9 to be pulled out from under the toggle trigger ||6, thus allowing the toggle to make up and produce engagement of the gears |09 and The auxiliary gear sectors 93 are rotatably mounted on the three grooved shaft 95 (Figs. 4 and 8) the grooves of which form key ways for disks |25 which carry pins |26 and which rock with the shaft 95. Those disks are mounted or journaled in holes in the frame plates which support the secondary register and provide bearings for supporting the shaft 95 in the frame.

. The pins |26 fixed in the disks |25 are arranged to act in a recess or cutaway portion |21 of the hub of the auxiliary gear sectors 93. When in their normal position as shown in Fig. 4 the pins |26 allow the sectors 93 to act individually under the force of the springs 94 to rotate the sectors clockwise as disclosed in Fig. 4. Such clockwise rotation of the sectors 93 depletes the force of their springs 94 according to the extent of clockwise movement. When, however, a transfer has taken place a lever |28 fixed to the right end (Fig. 8) of the shaft 95 is rotated counterclockwise from the position disclosed in Fig. l rotating with it the shaft 95 and the disks |25. Such rotation of the disks |25 causes their pins |26 drivingly to engage the right ends of the recesses |21 in the respective gear sectors 93 of the secondary register which have been displaced by a transfer and to restore those gear sectors to their normal positions and to re-energize the springs 94.

Such movement of the lever |28 is accomplished through a link |29 pivotally attached to the upper end of the lever |28, a lever |3| pivoted to its rear end, and a pickup link |32 attached to an arm |33 of the lever |3|. This pickup link |32 is formed with a hooked free end arranged to receive a dolly roll |34 pivoted on the gear as the dolly roll moves upwardly or counterclockwise with the gear when engaged with its pinion |09. `Thus when an engagement of the gear and its pinion |09 is effected through the toggle ||4, ||5 as already described, the roll picks up the hooked or free end of the pickup link |32 and carries it around in a pitmanlike action until a roll |36 mounted on the free end of the pickup link |32 engages the forward end of a guide rail |36 fixed to the right support or outside frame plate of the machine. When that occurs the action of the gear I disengages the roll |34 from the pickup link |32 and the train of auxiliary gear sector resetting and sector spring tension mechanism returns to normal through the action of a spring |31 (Fig. 10) which acts between a connection with the framework and an arm of the lever |29 on the sector shaft 95.

During the power action just described the levers |28 and |3| are so operated through the links |29 and |32 as to cause the automatic resetting of the gear sectors 93. At the end of the pitman-like action after disengagement of the roll |34 from the pickup link |32, a spring |39 acts to hold the pickup link roll |35 against the guide rail |36 where it comes to rest in the normal position shown in Fig. 9 ready for another power action.

On the side of the gear opposite that disclosed in Fig. 9 is a pin |39 which engages an arm |4| of the toggle lever ||5 during rotation of gear and causes the lever ||5 to be turned clockwise on its pivot |42 in the frame. Such clockwise turning of the lever 5 breaks the toggle action which holds the gear in engagement with its rotating pinion |09 and forces the toggle trigger ||6 to re-engage the latch lug ||9 of the latch arm ||f8 which holds the toggle against the makeup action of the spring I1.

But for the provision of novel means, the gear would not be rotated far enough by gear |09 in each cycle of operation to cause the latching of the toggle as just described to terminate such cycle, and therefore the gears would continue to re-engage and disengage rapidly following initiation of such cycle in the manner above described. To assure the necessary cycle terminating action the gear |I| is provided with two extra-long teeth |43 which are so arranged that they will cause engagement between the two gears |09 and after the other teeth on the gear have cleared those of the pinion |09, thus giving extra motion to the gear for latching the toggle trigger I6. The result of this extra-long tooth action is that it gives the gear an extra ilip after the other teeth have separated, thereby causing the pin |39 to continue its action against the arm |-4| until it latches the toggle trigger 6 and until the pin |39 passes the arm |4| and until the gear rotates something like one-eighth of a turn beyond the engagement of the long teeth |43 with the gear |09.

In the Comptometer disclosed in the Patent No. 2,063,962 aforesaid, when a zeroizing action is effected, the rock frame, which herein is the primary rock frame, is swung sufliciently in a direction to disengage the gears 66 from the gears 65, the numeral wheels are thus allowed to return to their zero position and are left in that position until further operation of the machine. In other words the rock frame remains out until a key of the machine is depressed, whereupon the 'rock frame in its disengaged re- 1l lation with its actuating mechanism is allowed to return to its engaged or active position through the breaking of the detaining toggle. According to that patent, the detaining toggle is' broken by a power action causing the rock frame to return to its active position.

In the instant invention, however, the rock frame of the primary register is returned to normal or active position as soon as a transfer is made in order to leave the secondary accumulator wheels free to receive their carrying action. To provide for the return of the primary rock frame immediately following a transfer, a toggle or jointed linkage is employed between a zero lever segment |44 and the lever |24. With such a jointed linkage the primary rock frame may be returned to its active position even when the zero hand lever |04 is erroneously held forward during a zeroizing operation. Such jointed linkage comprises two arms |45 and |46 (Fig. so joined at adjacent ends that they normally act like a rigid link with the joint below the center line between its two operating ends and with a stop armand pin to limit its dropping lower. Associated with that jointed linkage is a lever |41 operable by the power action of a dolly roll |48 on the lever |8| as it is swung upwardly and forwardly under power. The lever |41 is provided with an upwardly extending arm |48 having a stud |5| adapted upon such operation of the lever |41 to engage the arm |45 of the jointed linkage |45 and |48 and to break the jointed linkage at its center. f

With such a construction if the zeroizing hand lever |04 is drawn forward in a total transfer action and is misoperatively held forward, the jointed linkage will be broken at its center and permitted to double up, thus eliminating its action of preventing the return of the primary rock frame. The breaking action of the jointed linkage is so timed that it does not take place until after an actuating arm |52 on an actuating shaft |58 for the primary rock frame has been fully swung forward and the detaining toggle which holds the rock frame out in a transfer position is broken. The rock frame detaining toggle comprises a forward link |54 (Fig. 30) and a lever |55. The forward link |54 is pivoted at one end to an arm |55 fixed on the left end of the shaft |53 and is pivotally connected at its other end to an end of the lever arm |55 by a stud |51, the lever arm being pivotally supported on a short shaft 58 journaled in the frame of the machine. The breaking of the detaining toggle |54, |55 will allow the primary rock frame to return and the transfer gears 19 to clear the secondary or supertotalizer register, thus causing the jointed linkage |45, |45 to double up and to eliminate the resistance to the return of the primary rock frame to normal position after the primary register is cleared or zeroized.

Extending across the rear of the machine just below the power clutch hooks 52 and co-acting with the guide arms 53 is a transordinal rock' shaft |58 (Figs. 3 and 4) provided with arms which normally contact with the guide arms 53 when the rock frame has been swung forward in a zeroizing action. The shaft |58 is equipped at its left end with a link action, including a link |50 (Fig. 30) connected at its forward end by a pivot stud |50' to a suitable lever pivoted on the shaft |58, which, through engagement of stud |50' with an arm |55 of lever |55 during rearward movement of link |50, releases DI ymovement on the frame of the machine.

breaks the rock frame detaining toggle |54, |55. At the right end of this shaft an arm |5| is fixed thereon and extends downwardly therefrom (Fig. 10). The arm |5| is connected by a slotted link |82 and a pin |88 at its lower end with a, lever arm |54 of a lever |55. The head of a pivot stud of the link |28 and lever |8| is so arranged that as the link |28 and lever |8| move forward in storing power for the gear sectors 88 of the secondary register the stud head |58 engages an arm |81 of the lever |55 imparting forward or counter-clockwise (Fig. l0) rotation to the lever |55 thereby giving a forward action through the arm |84 to the link |52. When the rear end of the slot in the link |82 engages the pin |58 the link |82 pulls the pin |58 and the arm |5| forwardly and upwardly giving an action to the shaft |58, similar to that which it receives in a power action upon depression of a key. Such action comprising rearward movement of link |58 which causes the primary rock frame detaining toggle |54, |55 to be broken and the rock frame to swing inward disengaging the secondary register whereby the carrying mechanism of the secondary register is free to operate.

To avoid interference with the return of the transfer mechanism to its normal position when the zeroizing hand lever |84 is held in its forward position resulting in holding the locking lever |05 in locking relationship with the transfer key 82, a transfer lock release lever |58 (Fig. 10) is pivotally mounted for limited oscillatory The lever |88 is provided at its upper end with an operating lug or projection |88 and with spaced limiting lugs or projections |1| at opposite sides of a pin |12 in the frame of the machine. The operating lug 88 is adapted to be engaged by the stud |5| in the arm |48 of the toggle breaki118 lever |41 and to be rotated thereby in a counter-clockwise direction (Fig. 10). Rotational movement of the1ever |88 is limited by the limiting lugs |1| and the pin |12. When the lever |58 is so rotated in a counter-clockwise direction a stud |18 in the lower end of the lever is adapted to engage the transfer lock lever |05 and move it in a clockwise direction (Fig. 10) whereby to remove the bent lip |88 of the lever |05 from the upper notch |01 in the stem of the transfer key 82 and to permit it to return to normal position.

It is sometimes desirable to split up the parts of a cent into thousandths in extension work. In such cases it is desirable to have the primary register accumulate such fractions and to eliminate the transfer of any part of a cent to the secondary register. Thus after extension work has been completed on the primary register if it reads .500 or a larger fraction, 1 is added to the fourth column of keys or 5 is added to the third column which will give the same result. The lower three orders are then prevented from making a transfer. To accomplish this desirable result a key |14 (Fig. 10) is provided with a stem |15 slidably disposed in a housing |18 suitably mounted in the outer case 88. The stem has in its lower end a pin |11 adapted to be engaged by the bifurcated end of an arm |18 of a blocking lever |18 mounted on the secondary register numeral wheel shaft 12'. The blocking lever 18 is also provided with a downwardly extending arm |8| having a lateral stop projection |82 formed on the lower end thereof and adapted t9 be disposed in the path of the curved 111g a4 asume? 13 of the right or lowest order when the key |14 is depressed.

As shown in Figs. 6 and l the notches 81 of the shifting bar 88 in the three lowest denominational orders are of greaterwidth than the notches 81v of the other higher denominational orders. Disposed upon the bar 88 is a similar but shorter bar or plate |83 having three notches |88 therein adapted to receive the curved lugs 88. The plate |83 has a slot 88 cut therein through which extends a pin |88 fixed to the lower shifting bar 88. A spring |81 attached at one end to the pin |88 and at the other end to a pin |88 fixed to the plate |83 provides sumcient tension normally to cause the plate |83 to shift'with the bar 88. As shown in Fig. 6 the three right notches in the shifting bar 88 under the plate |83 are much wider than those to the left to permit movement of the bar .88 without moving the shifting forks 83 in the corresponding orders.

When it is desired however to prevent a transfer of totals from the three lowest denominational orders of the primary register mechanism to the associated denominational orders of the secondary register, the key |14 is depressed thus disposing the lateral projection |82 of the arm |8| in the path of the curved lug 8l in the units order. Depression oi' the transfer key 92 thereafter will cause lateral shifting from left to right (Fig. 6) of the bar 88 but the shifting forks 83 of the three lowest denominational orders will be held stationary by engagement of the stop projection |82 with the curved lug 84 and relative movement of the bar 86 with respect to the bar |83 is allowed against the tension of the spring |81 due to the wider notches 81 in the bar 58 associated with the three lowest denominational orders of the machine. Also the lugs 84 of the three lowest denominational orders not having been shifted into alignment with the arms |83 of the digital detent operating levers 98 the detents 91 of those three orders will not be released from the detents 98 of those denominational orders.

Thus the amount accumulated on the first three numeral wheels 13 of the primary register will be cleared and the first three numeral wheels 13' of the secondary register will not receive or accumulate any totals from the primary register.

Similar. means are employed in zeroizing or clearing/the supertotalizer or secondary register and the same general scheme of throwing the rock frame of the secondary register out and in is employed. The rock frame of the `secondary register is under the control of the zeroizing lever |89 (Figs. 1 and 2) journaled on a short transverse shaft |9| which extends through the outer casing of the machine (Fig. l). A zero lever |92 fixed to the inner end of the shaft 9| is provided with an upward extension |93 and a pin |98 fixed therein. The pin |94 is slidably disposed in a slot |95 formed in the rearward portion of a zero actuating link |98. At its forward end (to the left in Fig. 10) the link |98 is pivotally connected to the secondary rock frame actuating lever |91 which is rotatably mounted at its upper extremity on a stud |98 xed to the frame.

The actuating lever |91 is articulately connected at its lower extremity to a short link |99 which in turn is connected to an arm 28|. The arm 28| is fixed on a transordinal rock shaft 282 which is the secondary rock frame actuating shaft. A pin 283 (Fig. 4) fixed to an arm 288 rigidly mounted on the rock shaft 282 is disposed i 14 within the bifurcated portion of a depending arm 288 forming a part of a toggle lever 288 mounted on a transverse shaft 281 disposed in the secondary work frame. The toggle lever 288 is also provided with a forwardly extending arm 288 having an aperture in its forward extremity through which a transverse shaft 288 extends.

A zero stop lever 2|| is mounted for pivotal movement on the transverse shaft 281 and is adapted when the secondary rock frame is swung outwardly to be projected into the path of a lug (not shown) riveted to the carrying gear to prel vent further unwinding of the carrying gear spring. Short pivotal movement of the zeroizing lever |88 to the left as viewed in Fig. 2 will through the link and lever conne^tion |88. |91 cause counter-clockwise rotation of the shaft 282 with a consequent outward swing of the secondary rock frame and disengagement of the carrying gears 68' and accumulator pinions 85 of the secondary register mechanism.

'I'he secondary rock frame is maintained in its outward zeroized position by a detaining toggle until it is returned by depression of the transfer key 92 preparatory to a transfer operation. That detaining toggle comprises a rear toggle link 2|2 (Fig. 10) rotatably mounted on a stud in the frame. It is pivoted as at 2|3 to a front toggle link 2|4 which in turn is connected to the zero actuating link |98. When the actuating link |98 is moved forwardly or to the left as viewed in Fig. 10 by the action of the zeroizing lever |89 that link carries with it the front toggle link 2|! which in turn causes counter-clockwise rotation of the rear toggle link 2|2 until a forward extension 2|5 on the front link 2M contacts a stop stud or pin 2|6 fixed in the actuating link |96. The pivotal connection 2|3 between the links 2|2 and 2| 8 is just slightly below center as shown in Fig. 6, when the extension 2|8 engages the stop stud 2|6. The rock frame and its actuating parts are thus effectively maintained invtheir outward or zeroized position.

Thus the rock frame detaining toggle 2|2, 2|4 for the secondary register is on the right side and is attached to the actuating mechanism provided for rocking the rock frame actuating shaft. The means for breaking the detaining toggle and letting the secondary rock frame move into active or accumulating position is controlled by the transfer key 92. With such construction when the secondary register is cleared it remains out of engagement with its accumulator `pinion 88' until its detaining toggle 2|2, 2H is broken by depression of the transfer key 32 which occurs before the rock frame of the primary register is swung into active or transfer position.

The means for breaking the detaining toggle upon depression of the transfer key 92 is shown in Fig. 6. As therein illustrated the lever 89 is provided with a downwardly extending curved arm 2|1 having a detaining toggle grip stud 2|8 fixed in the free end thereof. When the secondary rock frame is in an outward zeroized position the trip stud 2| 8 is in engagement with a downwardly extending lug 2 9 formed on the rear toggle link 2|2. As already described depression of the transfer key 92 causes clockwise rotation of the lever 89 which results in similar movement of the rear toggle link 2|2 by engagement of the stud 2|8 with the lug 2|9, thus' breaking the toggle 2|2, 2H and allowing the return of the secondary rock frameby a spring 22| (Fig. 10).

Thus the secondary register rock frame swings in before the primary register mechanism is engaged with the secondary accumulator pinions 65' to allow time between the clearing action and the return to normal giving the mechanism returning to zero a chance to overcome any tendency of displacement or from getting out of gear.

The digital control disclosed in the patents hereinbefore mentioned is wholly that of addition and requires the co-digital marking of the keys. In the present invention however the co-digital marking of the keys is eliminated. The elimination of co-digital key markings results from the provision of novel means for digitally controlling the actuating mechanism of the machine whereby, when the machine is employed for negative calculation, complements of the respectively indicated key values are automatically added. With such novel means when performing negative calculation the actuating mechanism is controlled to add 8 upon depression of the #l key. 7 .upon depression of the #2 key, 6 upon depression of the #3 key, etc., in all orders to the left of the units order. In the units order during negative calculation depression of the #l key will add 9, depression of the #2 key will add 8, etc. As in the key set machines which perform examples in the four forms of arithmetic, means is provided for selectively setting the machine for addition, multiplication, subtraction or division. To facilitate the setting of the machine for addition and multiplication a special key marked with the addition sign is provided at the left side of the keyboard. Another special key with the sign of division on it is also provided on the left side of the keyboard rearwardly of the addition key. A special key with the sign of subtraction on it is provided on the right side of the keyboard. Another digital setting key is provided on the left side of the machine and is marked "SUPR with the subtraction sign. The last mentioned key sets the machine for subtraction of amounts from the super-totalizer or the number appearing in the secondary register.

Each of the presetting manipulative keys referred to is operatively connected to devices and mechanisms for setting the machine so that the actuating mechanism may be digitally controlled for the desired form of arithmetical calculation.

vThus when set for positive operation the machine will be ready for addition and multiplication. When set for negative operation the machine will be ready either for division or subtraction of the totals of the primary register or subtraction from totals of the secondary register depending upon the key depressed.

Besides the means for selectively preparing or setting the machine for the four forms of arithmetic, manipulative means is provided for clearing the negative setting of the machine and resetting it for positive forms of calculation. Such manipulative means is adapted to cooperate with the zeroizing mechanism to clear and reset the machine as the primary register is cleared whenever an amount is subtracted from the secondary register and while a subtraction is being made from the total of the primary register, after division, by the addition key and. after subtraction, automatically.

To that end in the machine of the drawings a supplemental or negative stop bar operating adjacent and beneath the regular or positive stop bar cooperates with and regulates the movement of each denominational order of the actuating mechanism to add complements of the numbers on the respective keys as they are depressed. The arrangement as disclosed in the drawings provides means for operating or setting the positive and negative stop bars in order that the machine may be controlled either positively in addition Aand multiplication by the positive stop bars or negatively in subtraction and division by the negative stop bars. 'I'he special digital setting or presetting manipulative keys hereinabove mentioned are employed to operate the bars for digitally controlling the actuating mechanisms according to whichever stop bars may be connected thereto.

As shown in Fig. 13 the positive and negative stop bars in each denominational order are designated by the reference characters 222 and 222, respectively, and are longitudinally reciprocal in offset lugs or keepers 224 on the upper part of the frame plate. The upper stop bar 222 is the positive stop bar. The negative stop bar 223 operates adjacent and beneath the positive stop bar.

Along its upper margin each of the positive and negative stop bars 222 and 223 is provided with a plurality of laterally extending, spaced, stop lugs 22B. The positive stop bar 222 in each order has a depending arm 226 which is formed or otherwise provided with an upwardly facing slot 221 in a laterally offset portion at the lower end of the arm 226. In opposed relation to that slot 221 is a downwardly facing slot 228 in a depending arm 229 of each negative stop bar, the arm 228 at its upper end being offset laterally sufiiciently to align the slot 22| with the opposed slot 221 (Figs. 19 and 21).

Thus the positive stop bar 222 is like those disclosed in the above mentioned Patent No. 2,063,962 and as in that patent the stop lugs 225 on each stop bar 222 are spaced progressively farther back of the key stems from the front to the rear of the machine, being stepped back a unit graduated step for each progressively higher key. In other words the forward stop lug 225 of each positive stop bar 222 is spaced one step back of the #1 key and the last or rearmost stop lug 225 of each positive stop bar 222 is spaced nine steps back of the #9 key in each denominational order. With the exception oi' the last or rearmost stop lug 22S, the stop lugs 225 of each negative stop bar 223 are spaced progressively farther back of the key stems from the rear to the front of the machine, being stepped back a unit graduated step for each progressively lower key. In other words the rearmost stop lug 225 of each negative stop bar 223 is directly beneath and aligned with the rearmost stop lug of each positive stop bar 222 and the stop lug 225 of each negative stop bar 223 is spaced one step back of the #8 key and the forward stop lug 225 of each negative stop bar is spaced eight steps back of the #1 key.

In said Patent No. 2,063,962 a link formed a permanent connection between the actuating sector and the stop bar of each denominational order. In the present invention a llnk 23| in each denominational order is permanently connected only with the actuating gear sector Si. The link 23| in each order is pivoted to the gear sector 6i and is provided at the rear end with a stud 232 fixed therein and carrying a square or box collar 233 which fits on the stud 232 and which is held in place by a buckled washer 234. Each buckled washer 234 is riveted on the end of the stud 222 of the same order to hold the box collar 233 on the stud and to provide friction for 

